arithmetic sequence - a sequence that increases or decreases by the same step

common difference - the constant additive rule from one term to the next

initial term - the first term in a sequence

successive terms - terms that are next to each other in a sequence

7, 5, 3, 1, ... - initial term $$7$$ and common difference $$-2$$

7, 9, 11, 13, ... - initial term $$7$$ and common difference $$2$$

-1.6, -1.3, -1, -0.7, ... - initial term $$-1.6$$ and common difference $$0.3$$

-1.6, -1.9, -2.2, -2.5, ... - initial term $$-1.6$$ and common difference $$-0.3$$

-2, 3, 8, 13, ... - fifth term $$18$$ and common difference $$5$$

38, 33, 28, 23, ... - ninth term $$-2$$ and common difference $$-5$$